JP2022133620A - Cutting machine - Google Patents

Abstract

To meet a demand for an irradiation part capable of clearly projecting a shadow of a blade tool onto the surface of a material to be cut.SOLUTION: An irradiation part 60 for emitting light toward a blade tool from the outside in a radial direction of the blade tool includes a first light source 72a, a second light source 72b, a first lens body 62a and a second lens body 62b arranged with a virtual plane including the blade tool in between. A first emission surface 65d of the first lens body 62a includes a first outermost peripheral edge part 65h which is farthest from a first central axis 73, passing a first light source center 72c of the first light source 72a and being perpendicular to the first light source 72a, and has a first distance r1. A second emission surface 65e of the second lens body 62b includes a second outermost peripheral edge part 65i which is farthest from a second central axis 74, passing a second light source center 72d of the second light source 72b and being perpendicular to the second light source 72b, and has a second distance r2. The first light source 72a and the second light source 72b are arranged so that a distance r3 between the first central axis 73 and the second central axis 74 is smaller than the sum of the first distance r1 and the second distance r2.SELECTED DRAWING: Figure 14

Description

TECHNICAL FIELD The present invention relates to a cutting machine used for cutting a material to be cut such as wood.

For example, this type of cutting machine has a cutting machine body having a cutting tool and a base that supports the cutting machine body so as to be vertically swingable. The cutting tool rotates using an electric motor as a power source. The rotating cutting tool is caused to cut into the material to be cut placed below the cutting machine body. Thereby, the material to be cut can be cut.

2. Description of the Related Art Conventionally, cutting machines equipped with, for example, lasers have been provided in order to confirm the cutting position of a cutting tool with respect to a material to be cut. The laser irradiates a laser beam toward the material to be cut placed below. The irradiation position of the laser beam is aligned with the black line drawn on the material to be cut. As a result, the cutting tool can be moved downward to cut at the position of the black line.

Furthermore, cutting machines equipped with LEDs for matching black lines instead of lasers have conventionally been provided. The cutting machines described in Patent Literatures 1 and 2 have one LED in the irradiation section provided on the extension of the disk surface. The LED emits light toward the cutting tool below. Therefore, the shadow of the cutting tool is cast on the surface of the material to be cut placed under the cutting tool. Align the shadow of the cutting tool with the ink line drawn on the material to be cut. As a result, the cutting tool can be moved downward to cut at the position of the black line.

U.S. Pat. No. 6,742,430 EP-A-2014399

For example, when the cutting machine body is positioned at the top dead center away from the material to be cut, it has been difficult to clearly cast the shadow of the cutting tool on the surface of the material to be cut with irradiation from one conventional LED. Therefore, it is sometimes difficult to match the shadow of the cutting tool with the ink line drawn on the material to be cut. Therefore, conventionally, there has been a need for an irradiation unit that can clearly project the shadow of the cutting tool on the surface of the material to be cut.

According to one feature of the present disclosure, a cutting machine has a cutting machine main body having a disk-shaped cutting tool, and an irradiation section that irradiates the cutting tool with light from the radially outer side of the cutting tool. The irradiation section has a first light source and a second light source, and a first lens body and a second lens body, which are arranged with a virtual plane including the cutting tool therebetween. The first lens body has a first incident surface into which light from the first light source is incident and a first exit surface from which the light is emitted. The second lens body has a second incident surface on which light from the second light source is incident and a second exit surface from which the light is emitted. The first exit surface has a first outermost edge having a first distance furthest from a first central axis passing through the first light source center of the first light source and perpendicular to the first light source. The second exit surface has a second outermost edge having a second distance furthest from a second central axis passing through the second light source center of the second light source and perpendicular to the second light source. The first light source and the second light source are arranged such that the distance between the first central axis and the second central axis is smaller than the sum of the first distance and the second distance.

Therefore, the light emitted by the first light source passes through the first lens body and is emitted from the first emission surface. Light emitted from the second light source passes through the second lens body and is emitted from the second emission surface. The first exit surface and the second exit surface are provided close to each other by making the distance between the first central axis and the second central axis smaller than the sum of the first distance and the second distance. Therefore, the distance between the first exit surface and one side surface (for example, the right side surface) of the cutting tool becomes small. The second exit surface has a smaller distance from the other side surface (for example, the left side surface) of the cutting tool. A material to be cut is placed on the opposite side of the cutting tool from the irradiation section. Therefore, the light emitted from the first emission surface and the second emission surface is suppressed from going around between the cutting tool and the material to be cut. As a result, the shadow of the cutting tool can be clearly projected on the surface of the material to be cut.

1 is a perspective view of a cutting machine according to a first embodiment; FIG. It is a right side view of a cutting machine. It is a front view of a cutting machine. Fig. 2 is a left side view including a partial longitudinal section of the cutting machine when the cutting machine main body is positioned at the top dead center; 4 is a longitudinal sectional view partially enlarging the irradiation section when the cutting machine body is moved downward at a predetermined angle K from the top dead center; FIG. Fig. 10 is a left side view including a partial longitudinal section of the cutting machine when the cutting machine main body is moved downward at a predetermined angle K from the top dead center; FIG. 4 is a perspective view of a state in which each component of the irradiation section is assembled; It is a perspective view of a condensing lens and an LED board. It is the top view which looked at the condensing lens and the LED board from the output surface side. It is a bottom view which shows the positional relationship of a cutting tool, LED, and a condensing lens. It is a side view of a condensing lens. It is a perspective view of a condensing lens. It is the top view which looked at the condensing lens from the entrance surface side. It is the top view which looked at the condensing lens from the output surface side. FIG. 10 is a cross-sectional view taken along line XV-XV in FIG. 9; FIG. 10 is a cross-sectional view taken along line XVI-XVI in FIG. 9; FIG. 16 is a cross-sectional view taken along line XVII-XVII in FIG. 15; FIG. 11 is a side view of a condensing lens according to a second embodiment; It is a perspective view of a condensing lens. It is the top view which looked at the condensing lens from the entrance surface side. It is the top view which looked at the condensing lens from the output surface side. FIG. 21 is a cross-sectional view taken along line XXII-XXII in FIG. 20; This figure shows a state in which the condenser lens and the LED are assembled.

A first embodiment of the present disclosure will be described based on FIGS. In this embodiment, a cutting machine 1 called a so-called slide circular saw is exemplified. As shown in FIG. 1, the cutting machine 1 has a base 2 to be placed on a desk or floor, a turntable 4 for placing a material to be cut, and a cutting machine main body 10 . The turntable 4 is positioned above the base 2 and supported by the base 2 . The cutting machine main body 10 is provided above the turntable 4 . A substantially disc-shaped cutting tool 11 called a tipped saw blade is rotatably supported in the cutting machine body 10 . The user is positioned in front of the cutting machine 1 and performs the cutting work. In the following description, the up, down, left, and right directions of members and structures are defined based on the user. Regarding the front-rear direction of members and structures, the front side is the front side when viewed from the user. In addition, the direction in which the LED 72 is directed, that is, the irradiation direction of the irradiation line L is P, the opposite direction is Q, the upstream side in the direction of rotation of the cutting tool in the plate thickness direction of the LED substrate is T, and the downstream side is U (PQ and TUs are orthogonal).

As shown in FIG. 1, the turntable 4 has a substantially circular shape in plan view. A table top surface 4a of the turntable 4 is provided horizontally. The turntable 4 is horizontally rotatable with respect to the base 2 around a rotary support shaft 2a located in the center of the substantially circular shape. Auxiliary tables 3 having the same height as the table top surface 4a are attached to the right and left sides of the turntable 4 on the left and right sides of the base 2 respectively. The turntable 4 has a table extension 5 extending along the side of the cutting tool 11 . A cutting edge plate 5a extending in the horizontal direction is provided on the upper surface of the table upper surface 4a and the table extension portion 5. As shown in FIG. A notch-shaped slot 5b extending along the side surface of the cutting tool 11 is provided in the center of the cutting edge plate 5a.

As shown in FIGS. 1 and 4, above the turntable 4, a wall-shaped positioning fence 6 extending in the left-right direction and extending upward is provided. The positioning fence 6 has a positioning surface 6a standing vertically on the front surface. The positioning surface 6a is positioned on a vertical plane passing through the rotation support shaft 2a, which is the center of rotation of the turntable 4. As shown in FIG. The workpiece W placed on the table upper surface 4a is brought into contact with the positioning surface 6a and positioned in the front-rear direction.

As shown in FIGS. 1 and 4, an arcuate miter scale plate 7 is provided on the front portion of the base 2 in a substantially half-circumferential region. The miter scale plate 7 is provided so as to extend horizontally below the table top surface 4a. The miter scale plate 7 has a plurality of groove-like positioning recesses 7b extending in the radial direction. The positioning recesses 7 b are provided at predetermined angular intervals in the circumferential direction of the miter scale plate 7 . A tip portion of a positioning pin 52, which will be described later, can enter the positioning recess 7b. The miter scale plate 7 is fixed to the base 2 by fixing screws 7a. The fixing screw 7a is inserted into the elongated hole of the base 2. As shown in FIG. By loosening the fixing screw 7a and moving the miter scale plate 7 in the horizontal direction, the angle between the positioning fence 6 and the cutting tool 11 can be finely adjusted. For example, the angle between the cutting tool 11 and the positioning fence 6 can be precisely adjusted to a right angle with the positioning pin 52 inserted into the positioning recess 7b at the right angle position. This adjustment is mainly made during the production process of the product.

As shown in FIG. 4, a main body support arm 40 extending substantially upward is provided behind the turntable 4 . The body support arm 40 is supported so as to be tiltable in the left-right direction with respect to the arm support portion 4b of the turntable 4 about a laterally-extending tilting support shaft 40a. A long slide bar 41 extending parallel to the side surface of the cutting tool 11 and along a horizontal line is provided on the upper portion of the main body support arm 40 . Two slide bars 41 are arranged side by side in the vertical direction. The slide bar 41 supports a slide base 42 that is slidable in the front-rear direction. By sliding the slide base 42 in the front-rear direction, the cutting tool 11 can cut the material W placed on the turntable 4 and having a wide width in the front-rear direction. The cutting machine main body 10 can swing vertically with respect to the slide base 42 around a vertically swinging support shaft 10a extending in the left-right direction.

As shown in FIG. 3, the cutting tool 11 is integrally attached to an output shaft 23 that extends in the left-right direction and is rotatably supported by the cutting machine body 10 . The cutting tool 11 is attached to the output shaft 23 by tightening the fixing screw 14 with its center of rotation sandwiched between the outer flange 15 and the inner flange 16 .

As shown in FIG. 1, the cutter main body 10 has a fixed cover 12 and a movable cover 13 that cover the cutting tool 11 . The fixed cover 12 covers the upper half circumference of the cutting tool 11 . On the left side of the fixed cover 12, a blank arrow 12a indicating the rotation direction of the cutting tool 11 is displayed. The movable cover 13 can cover the lower half circumference of the cutting tool 11 . The movable cover 13 rotates in conjunction with the vertical swing of the cutting machine body 10 to open and close the lower half circumference of the cutting tool 11 . When the cutting machine main body 10 is swung upward, the movable cover 13 rotates in the closing direction (clockwise direction in FIG. 1). Thereby, the lower half circumference range of the cutting tool 11 is covered. When the cutting machine main body 10 is swung downward, the movable cover 13 rotates in the opening direction (counterclockwise direction in FIG. 1). As a result, the lower half circumference of the cutting tool 11 is exposed.

As shown in FIG. 3, the movable cover 13 is integrally molded from a resin member having high light transmittance. The resin material is, for example, transparent polycarbonate. The movable cover 13 has a through-hole 13a extending in the circumferential direction and passing through the movable cover 13 from inside to outside.

As shown in FIGS. 2 and 4, a dust collection guide 17 having an open front and a substantially C-shaped cross section is provided on the rear lower side of the fixed cover 12 . The dust collection guide 17 suppresses chips generated by cutting the material W to be cut from scattering to the rear or left and right sides of the cutting tool 11 . An upper portion of the dust collection guide 17 communicates with a dust collection hose 17a extending rightward from the rear portion of the cutting machine main body 10. As shown in FIG. A front part of the main body support arm 40 is provided with a cylindrical rear dust collection port 18 which is open at the front. The rear dust collection port 18 suppresses scattering of chips behind the dust collection guide 17 . The dust collection guide 17 and the rear dust collection port 18 communicate with dust collection hoses 17a and 18a, respectively. The dust collection hoses 17a and 18a are connected to a dust collector installed separately from the cutting machine 1. As a result, chips scattered around the dust collection guide 17 and the rear dust collection port 18 can be sent to the dust collector through the dust collection hoses 17a and 18a.

As shown in FIGS. 2 and 3, the cutting machine body 10 has a motor housing 20 on the right side of the fixed cover 12. As shown in FIG. The motor housing 20 has a substantially cylindrical shape that extends upward and to the right as it goes rearward when the cutting machine body 10 is positioned at the top dead center. An air intake port 20a capable of taking in outside air is provided on the front end surface on the rear right side of the motor housing 20 . The cutting machine main body 10 houses an electric motor 21 . As an example of the electric motor 21, a motor called a DC brushless motor is used.

As shown in FIG. 3, a gear housing 22 is provided between the motor housing 20 and the fixed cover 12 in the left-right direction. The motor housing 20 and the gear housing 22 communicate internally. The power of the electric motor 21 is transmitted to the output shaft 23 through a reduction gear train accommodated in the gear housing 22 while being reduced in speed. Therefore, the cutting tool 11 attached to the output shaft 23 is rotated around the output shaft 23 by driving the electric motor 21 . As shown in FIG. 2, the rear part of the gear housing 22 is provided with an exhaust port 20b. A fan attached to the motor shaft rotates when the electric motor 21 is driven. Therefore, in the motor housing 20, the cooling air flows from the intake port 20a toward the exhaust port 20b. The electric motor 21 is cooled by this cooling air.

As shown in FIG. 2, a rectangular box-shaped controller housing 27 is provided above and adjacent to the cutting machine body 10 . Controller housing 27 accommodates controller 28 . The controller 28 has a shallow rectangular parallelepiped case and a control board housed in the case and molded with resin. The controller 28 mainly includes a control circuit for controlling the operation of the electric motor 21, a drive circuit, an auto-stop circuit, and the like. The control circuit has a microcomputer that transmits a control signal to the electric motor 21 based on the position information of the rotor of the electric motor 21 . The drive circuit has FETs that switch the current of the electric motor 21 based on control signals received from the control circuit. The auto-stop circuit cuts off power supply to the electric motor 21 so as not to cause an over-discharge or over-current state according to the detection result of the state of the battery pack 26, which will be described later.

As shown in FIG. 2 , the cutting machine body 10 has a battery mounting portion 25 behind the motor housing 20 . A mounting surface of the battery mounting portion 25 extends in a direction substantially orthogonal to the longitudinal direction of the motor housing 20 . The battery mounting portion 25 can be attached and detached by sliding a substantially rectangular box-shaped battery pack 26 . The battery pack 26 is, for example, a lithium ion battery with an output voltage of 36V. The battery pack 26 can be detached from the battery mounting portion 25 and repeatedly charged using a separately prepared charger. The battery pack 26 can be reused as a power supply between other rechargeable power tools such as screwdrivers and electric drills.

As shown in FIG. 3, a handle portion 30 is provided on the front upper portion of the cutting machine main body 10 . The handle portion 30 is arranged to the right of the fixed cover 12 . The handle portion 30 has a loop-shaped operation handle 31 extending in the left-right direction. A switch lever 32 is provided on the inner peripheral side of the operating handle 31 . The switch lever 32 can be pulled by a user's finger while gripping the operating handle 31 . When the switch lever 32 is pulled, the electric motor 21 is started. A lock-off button 33 is provided on the upper portion of the operating handle 31 . By pressing the lock-off button 33, the switch lever 32 can be pulled. This prevents the electric motor 21 from being started unexpectedly.

As shown in FIG. 3, an irradiation unit switch 34 is provided on the inner peripheral side of the operation handle 31 and on the surface facing the switch lever 32 . By pressing the irradiation unit switch 34, the LED 72 (see FIG. 4) of the irradiation unit 60 provided on the front upper portion of the fixed cover 12 can be turned on or off. The irradiation unit 60 will be described later in detail.

As shown in FIGS. 1 and 4, a turntable fixing mechanism 45 is provided below the table extension portion 5 . A grip portion 46 is provided at the front portion of the table extension portion 5 . The grip portion 46 has an uneven shape on the peripheral edge portion so that the user can easily hold and rotate the grip portion 46 . A user can grip the grip portion 46 to rotate the turntable 4 horizontally with respect to the base 2 . A fixed rod 47 extends from the grip portion 46 toward the inside rearward of the table extension portion 5 . A fixed rod 47 is supported inside the table extension 5 by means of a threaded engagement. When the grip portion 46 is rotated around the axis of the fixed rod 47, the fixed rod 47 is displaced in the front-rear direction. By displacing the fixed rod 47 rearward, the turntable 4 is locked with respect to the base 2 at a predetermined miter angle. By displacing the fixed rod 47 forward, the turntable 4 is unlocked from the base 2 .

As shown in FIGS. 1 and 4, a positive lock mechanism 50 is provided below the table extension 5. As shown in FIGS. The positive lock mechanism 50 has an unlocking lever 51 and a positioning pin 52 . The lock release lever 51 is provided in the front portion of the table extension portion 5 at the upper rear side of the grip portion 46 . The positioning pin 52 is connected to the unlocking lever 51 and extends rearward inside the table extension portion 5 . The positioning pin 52 is provided at substantially the same height as the miter scale plate 7 . The positioning pin 52 is normally biased rearward. The rear end of the positioning pin 52 biased backward can enter the positioning recess 7b. When the turntable 4 is rotated horizontally by gripping the grip portion 46, the positioning pin 52 enters one of the plurality of positioning recesses 7b. Therefore, the turntable 4 is positioned at a predetermined miter angle position corresponding to the positioning recess 7b. When the lock release lever 51 is pushed, the positioning pin 52 is displaced forward against the biasing force. Therefore, the rear end of the positioning pin 52 is disengaged from the positioning recess 7b.

As shown in FIGS. 4 and 5 , the irradiation section 60 is provided on the inner peripheral side of the front upper portion of the fixed cover 12 . The irradiation section 60 has two LEDs 72 as light sources, a substrate 71 on which the two LEDs 72 are mounted, and an irradiation section cover 70 that supports the substrate 71 and is attached to the fixed cover 12 . The irradiation unit 60 has a lens connecting body 61 that changes the irradiation direction of the LEDs 72 . The irradiation unit 60 is positioned radially outward of the cutting tool 11 and irradiates the cutting tool 11 with light. The irradiation unit cover 70 extends long in the circumferential direction of the fixed cover 12 along the circumferential side surface of the fixed cover 12 . The irradiation unit cover 70 has a through-hole 70b penetrating inside and outside along the radial direction of the fixed cover 12 . The fastening bolt 70 a is passed through the through hole 70 b and fastened to the screw hole 12 b provided in the fixed cover 12 . Thereby, the irradiation unit cover 70 is attached to the fixed cover 12 .

As shown in FIGS. 5, 7 and 9, the substrate 71 is made of aluminum and has a rectangular plate shape. The board 71 is mounted with two LEDs 72 and an LED control section 71a. The LED control unit 71a turns on or off the two LEDs 72 based on command signals sent from the controller 28 (see FIG. 2). A through hole 71b is formed in the central portion of the substrate 71 so as to penetrate the substrate 71 in the thickness direction. A threaded hole 70 c extending radially of the fixed cover 12 is provided on the inner peripheral side of the irradiation unit cover 70 . A fastening bolt 71d is passed through the through hole 71b and fastened to the screw hole 70c. The substrate 71 is thereby attached to the irradiation unit cover 70 .

As shown in FIG. 8, two lens bodies 62 are connected to form one lens connection body 61 . The lens connecting body 61 has three legs 67 . The leg portion 67 has a cylindrical columnar portion 67b. Three through holes 71c are formed in the front portion of the substrate 71 so as to penetrate the substrate 71 in the thickness direction. The columnar portion 67b is inserted into the through hole 71c, and the tip of the columnar portion 67b is crimped (collapsed) on the back side (upper side) of the substrate 71 to expand in the radial direction to form the enlarged diameter portion 67c. The enlarged diameter portion 67 c prevents the lens connecting body 61 from being removed from the substrate 71 . (See FIG. 16). As a result, the lens connecting body 61 is attached to the substrate 71 .

As shown in FIG. 10, the irradiation section 60 has two LEDs 72 including a first light source 72a and a second light source 72b, and two lens bodies 62 including a first lens body 62a and a second lens body 62b. A first light source center 72c of the first light source 72a is arranged to the right of a virtual plane extending the right side surface 11a of the cutting tool 11 . A second light source center 72d of the second light source 72b is arranged to the left of a virtual plane extending the left side surface 11b of the cutting tool 11 . The first light source 72a and the second light source 72b are arranged so that their front and back positions are the same. The first lens body 62a is arranged around a first central axis 73 passing through the first light source center 72c and perpendicular to the surface of the first light source 72a. The second lens body 62b is arranged around a second central axis 74 passing through the second light source center 72d and perpendicular to the surface of the second light source 72b. The first center shaft 73 and the second center shaft 74 extend in the same direction.

As shown in FIGS. 11 to 14, the second lens body 62b is formed symmetrically with the first lens body 62a. In the following description, only one of the overlapping structures of the first lens body 62a and the second lens body 62b will be described in detail. The first lens body 62a has a substantially conical shape whose diameter increases from the entrance surface 64 side toward the exit surface 65 side. The first entrance surface 64d and the first exit surface 65d of the first lens body 62a have arc-shaped outer peripheral edges centered on the first central axis 73 . The second entrance surface 64e and the second exit surface 65e of the second lens body 62b have circular arc-shaped outer peripheral edges centered on the second central axis 74 .

As shown in FIGS. 13 and 15, the first lens body 62a has a planar substrate contact surface 63 on the end surface on the incident surface 64 side. The substrate contact surface 63 contacts the surface of the substrate 71 . The incident surface 64 includes a first incident surface 64d on the first lens body 62a side and a second incident surface 64e on the second lens body 62b side. The first incident surface 64 d has an incident surface concave portion 64 a recessed from the substrate contact surface 63 toward the axial direction of the first central axis 73 . The incident surface recess 64 a is recessed in a substantially cylindrical shape centered on the first central axis 73 . The first light source 72a is accommodated in the incident surface recessed portion 64a with the first light source center 72c arranged on the first central axis 73 . The incident surface concave portion 64a is closed while accommodating the first light source 72a by bringing the substrate 71 and the substrate contact surface 63 into contact with each other.

As shown in FIG. 15, the second light source 72b is accommodated in the incident surface concave portion 64a on the second lens body 62b side with the second light source center 72d arranged on the second central axis 74. As shown in FIG. The incident surface concave portion 64a is closed while accommodating the second light source 72b by bringing the substrate 71 and the substrate contact surface 63 into contact with each other. The incident surface concave portion (first incident surface concave portion) 64a on the side of the first lens body 62a and the incident surface concave portion (second incident surface concave portion) 64a on the side of the second lens body 62b are separated by a substrate contact surface 63 therebetween. It is

As shown in FIG. 15, the side surface 64b of the incident surface recessed portion 64a at least partially includes a spherical shape centered on the first light source center 72c. In other words, the side surface 64b includes at least a portion of an arcuate cross section centered on the first light source center 72c on the cross section passing through the first central axis 73 . The arc-shaped cross section of the side surface 64b is provided mainly below the surface of the first light source 72a. A spherical projection 64c centered on the first central axis 73 and protruding toward the first light source 72a is provided on the bottom surface of the incident surface recess 64a. The incident surface recessed portion 64a, the side surface 64b, and the spherical convex portion 64c are all incident surfaces 64 through which the light emitted by the LED 72 enters the lens body 62. As shown in FIG.

As shown in FIG. 14, the exit surface 65 includes a first exit surface 65d on the side of the first lens body 62a and a second exit surface 65e on the side of the second lens body 62b. The first emission surface 65d has an arc-shaped first outer peripheral edge 65f centered on the first central axis 73 . A first outermost peripheral edge portion 65h on the first outer peripheral edge 65f is positioned farthest from the first central axis 73 and has a first distance r1 therebetween. Since the first outer peripheral edge 65f is arcuate, any point on the first outer peripheral edge 65f corresponds to the first outermost peripheral edge 65h. The second emission surface 65e has an arc-shaped second outer peripheral edge 65g centered on the second central axis 74. As shown in FIG. A second outermost peripheral edge portion 65i on the second outer peripheral edge 65g is positioned farthest from the second central axis 74 and has a second distance r2 therebetween. Any point on the arc-shaped second outer peripheral edge 65g corresponds to the second outermost peripheral edge 65i.

As shown in FIG. 14, the distance r3 between the first central axis 73 and the second central axis 74 is smaller than the sum of the first distance r1 and the second distance r2. Therefore, the first emission surface 65d and the second emission surface 65e have a shape in which the central portions of the two arc shapes are partially overlapped when viewed from the direction of the first central axis 73 . The first outer peripheral edge 65f and the second outer peripheral edge 65g intersect each other at their ends. The first outer peripheral edge 65f has an arc shape centered on the first central axis 73 and having a central angle A1. The second outer peripheral edge 65g has an arc shape centered on the second central axis 74 and having a central angle A1. The central angle A1 is greater than 180° and less than 360°.

As shown in FIGS. 14 and 15, the first lens body 62a has an exit surface convex portion 65b projecting in the axial direction of the first central shaft 73 radially inward of the first outer peripheral edge 65f. The exit surface convex portion 65b has a substantially cylindrical shape centered on the first central axis 73 . The outer peripheral surface of the output surface convex portion 65b is substantially spherical with a predetermined point on the first central axis 73 as the center. The inner peripheral surface of the output surface convex portion 65 b extends in the axial direction of the first central shaft 73 . The first lens body 62a has a central recessed portion 65c recessed in the axial direction of the first central shaft 73 radially inward of the exit surface convex portion 65b. The central recessed portion 65 c has a cylindrical shape centered on the first central shaft 73 when viewed from the axial direction of the first central shaft 73 . In other words, the central concave portion 65c is provided centering on the axial center of the output surface convex portion 65b. A bottom surface of the central recess 65 c is perpendicular to the first central axis 73 .

As shown in FIGS. 14 and 15, the first lens body 62a has an arcuate recess 65a recessed in the axial direction of the first central axis 73 between the first outer peripheral edge 65f and the output surface protrusion 65b. The arc-shaped concave portion 65 a has an arc shape centered on the first central shaft 73 when viewed from the axial direction of the first central shaft 73 . The arc-shaped concave portion 65a surrounds the outer periphery of the output surface convex portion 65b. The emission surface convex portion 65b, the central concave portion 65c, and the arcuate concave portion 65a are all the emission surface 65 from which the light emitted by the LED 72 is emitted.

As shown in FIGS. 12 and 15, the first lens body 62a has a substantially conical outer peripheral side surface 66 connecting the outer peripheral end of the substrate contact surface 63 and the first outer peripheral edge 65f. The outer peripheral side surface 66 is an outer reflecting surface 66a that reflects light toward the inside of the first lens body 62a within the first lens body 62a. The outer reflecting surface 66a has a diameter centered on the first central axis that increases from the first incident surface 64d toward the first output surface 65d. In addition, the outer reflecting surface 66a is formed in an outwardly convex arc shape on a cross section passing through the first central axis 73 .

As shown in FIG. 17, the outer reflecting surface 66a is a cross-sectional arc line 66b having an arc-shaped outer peripheral edge on a cross section orthogonal to the first central axis 73. As shown in FIG. The cross-sectional arc line 66b has an arc shape with a central angle A2 around the first central axis 73 in any cross section from the first incident surface 64d to the first exit surface 65d (see FIG. 15). The central angle A2 is greater than 180° and less than 360°.

As shown in FIG. 15, light emitted from the second light source center 72d of the second light source 72b enters the lens body 62 from the bottom surface or side surface 64b of the incident surface concave portion 64a or the spherical convex portion 64c. Light incident from the spherical convex portion 64 c is refracted toward the axial direction of the second central axis 74 . Then, the light is emitted in the axial direction of the second central shaft 74 from the bottom surface of the central recessed portion 65c. The light incident from the bottom surface of the entrance surface recess 64a is refracted in two stages, the bottom surface of the entrance surface recess 64a and the outer peripheral surface of the exit surface protrusion 65b. As a result, the light is emitted in the axial direction of the second central shaft 74 from the outer peripheral surface of the emission surface convex portion 65b. The light incident from the side surface 64b travels in the normal direction of the side surface 64b and is reflected in the axial direction of the second central axis 74 by the outer reflecting surface 66a. Then, the light is emitted in the axial direction of the second central shaft 74 from the arcuate recess 65a or from the area between the arcuate recess 65a and the second outer peripheral edge 65g. Thus, the light emitted from the second emission surface 65 e is emitted in a state aligned in the axial direction of the second central axis 74 . Similarly, the light emitted from the first light source 72a and emitted from the first emission surface 65d is emitted while being aligned in the axial direction of the first central axis 73. As shown in FIG.

As shown in FIGS. 12 and 14, the leg portion 67 has an outwardly extending portion 67a extending laterally of the lens body 62 from the first outer peripheral edge 65f or the second outer peripheral edge 65g. The columnar portion 67b extends from the tip of the outwardly extending portion 67a toward the incident surface 64 side from the output surface 65 side. Therefore, the leg portion 67 is arranged at a position out of the path of light passing through the lens body 62 .

As shown in FIG. 4, the light emitted from the emitting surface 65 (see FIG. 15) of the lens coupling body 61 is irradiated from above the cutting tool 11 toward below where the material W to be cut is placed. When the cutting machine main body 10 is positioned at the top dead center, the irradiation line L of light is slightly slanted rearward as it goes downward. The irradiation line L passes in front of a point directly below the output shaft 23 which is the rotation center of the cutting tool 11 on a horizontal imaginary plane S passing through the lower end of the cutting tool 11 . As shown in FIG. 6, the cutting machine body 10 is swung downward at a predetermined angle K from the top dead center to a predetermined position between the top dead center and the bottom dead center to bring the lower end of the cutting tool 11 closer to the material W to be cut. At this time, on a horizontal virtual plane S passing through the lower end of the cutting tool 11, the irradiation line L approaches the point directly below the output shaft 23, which is the center of rotation of the cutting tool 11, and passes slightly ahead of the point directly below. The virtual plane S is parallel to the upper surface of the material W to be cut, and becomes flush with the upper surface of the material W to be cut when the lower end of the cutting tool 11 hits the upper surface of the material W to be cut.

As described above, the cutting machine 1 has a cutting machine main body 10 having a disk-shaped cutting tool 11 as shown in FIG. . As shown in FIG. 10, the irradiation section 60 has a first light source 72a and a second light source 72b arranged with a virtual plane including the cutting tool 11 therebetween, and a first lens body 62a and a second lens body 62b. As shown in FIG. 15, the first lens body 62a has a first incident surface 64d into which light is incident from the first light source 72a and a first exit surface 65d from which the light is emitted. The second lens body 62b has a second entrance surface 64e into which light from the second light source 72b is incident and a second exit surface 65e from which the light exits. As shown in FIG. 14, the first exit surface 65d is furthest from a first central axis 73 that passes through the first light source center 72c of the first light source 72a and is perpendicular to the first light source 72a, and has a first distance r1. It has a first outermost peripheral portion 65h. The second exit surface 65e is the second outermost peripheral edge that is farthest from a second central axis 74 that passes through the second light source center 72d of the second light source 72b and is perpendicular to the second light source 72b, and has a second distance r2. 65i. The first light source 72a and the second light source 72b are arranged such that the distance r3 between the first central axis 73 and the second central axis 74 is smaller than the sum of the first distance r1 and the second distance r2.

Therefore, the light emitted by the first light source 72a passes through the first lens body 62a and is emitted from the first emission surface 65d. The light emitted by the second light source 72b passes through the second lens body 62b and is emitted from the second emission surface 65e. The first emission surface 65d and the second emission surface 65e are provided close to each other by making the distance r3 between the first central axis 73 and the second central axis 74 smaller than the sum of the first distance r1 and the second distance r2. . Therefore, the distance between the first exit surface 65d and the right side surface 11a of the cutting tool 11 is reduced. The distance between the second exit surface 65e and the left side surface 11b of the cutting tool 11 is reduced. A material to be cut W is placed on the opposite side of the cutting tool 11 from the irradiation unit 60 . Therefore, light emitted from the first emission surface 65d and the second emission surface 65e is suppressed from going around between the cutting tool 11 and the material W to be cut. Thereby, the shadow of the cutting tool 11 can be clearly reflected on the surface of the material W to be cut.

According to another feature of the present disclosure, the first lens body 62a and the second lens body 62b are a one-piece lens assembly 61 as shown in FIG. Therefore, it is sufficient to assemble one lens connecting body 61 in the irradiation section 60 . Therefore, the distance between the first light source 72a and the second light source 72b can be shortened while maintaining the ease of assembly of the irradiation unit 60 in a favorable manner.

According to another feature of the present disclosure, the first output surface 65d has an arc-shaped first outer peripheral edge 65f centered on the first central axis 73 and having a length that spans greater than 180° as shown in FIG. have. The second emission surface 65e has an arc-shaped second outer peripheral edge 65g centered on the second central axis 74 and having a length over a range larger than 180°. The first outer peripheral edge 65f and the second outer peripheral edge 65g intersect.

Therefore, the light emitted from the first emission surface 65d has less unevenness in brightness in the circumferential direction of the first emission surface 65d. The light emitted from the second emission surface 65e has less unevenness in brightness in the circumferential direction of the first emission surface 65d. Therefore, the unevenness of the brightness in the irradiation range on the surface of the material W to be cut is reduced. Thereby, the shadow of the cutting tool 11 can be clearly reflected on the material W to be cut. Moreover, the distance between the first central axis 73 and the second central axis 74 can be shortened. Thus, the distance between the first light source 72a and the second light source 72b can be shortened while ensuring the shape of the lens body 62 necessary for clearly projecting the shadow of the cutting tool 11 onto the material W to be cut.

According to another feature of the present disclosure, the first lens body 62a reflects light incident through the first entrance surface 64d and passing through the first lens body 62a toward the first exit surface 65d, as shown in FIG. It has an outer reflective surface 66a. The outer reflecting surface 66a has an outwardly convex curvilinear shape on a cross section passing through the first central axis 73 and becomes farther from the first central axis 73 as it goes from the first incident surface 64d toward the first emitting surface 65d. be. Therefore, the light that enters the first lens body 62a through the first incident surface 64d and travels outward from the first lens body 62a can be directed toward the first exit surface 65d by the outer reflecting surface 66a. Therefore, loss of light can be suppressed. Moreover, the directions of the light emitted from the first emission surface 65d are aligned. Therefore, it is possible to reduce the unevenness of the brightness of the irradiation light.

According to another feature of the present disclosure, the outer reflective surface 66a is angled 180° about the first central axis 73 anywhere from the first entrance surface 64d to the first exit surface 65d as shown in FIG. is a cross-sectional arc line 66b having a cross-sectional arc shape having a length over a large range (see FIG. 17). Therefore, the distance between the first light source 72a and the second light source 72b can be shortened while ensuring the shape of the lens body 62 necessary for reducing the unevenness of the brightness of the irradiation light.

According to another feature of the present disclosure, the first lens body 62a includes an entrance surface recess 64a formed in the first entrance surface 64d as shown in FIGS. It has a spherical convex portion 64c projecting toward. Therefore, by providing the incident surface concave portion 64a, it is possible to suppress the thickness of the first lens body 62a in the axial direction of the first central axis 73 from increasing. Moreover, by providing the spherical convex portion 64c, light can be refracted toward the axial direction of the first central axis 73 without increasing the thickness of the first lens body 62a more than necessary.

According to another feature of the present disclosure, at least a portion of the side surface 64b of the incident surface recess 64a is arcuate about the center of the first light source 72a on a cross section passing through the first central axis 73 as shown in FIG. is. Therefore, the light passing through the arcuate cross-sectional portion of the side surface 64b is generally directed in the normal direction of the side surface 64b. Therefore, refraction of light is suppressed at the arc-shaped cross-sectional portion of the side surface 64b. As a result, the light emitted from the first emission surface 65d can be made uniform without unevenness.

According to another feature of the present disclosure, the first lens body 62a has an entrance surface recess 64a formed in the first entrance surface 64d as shown in FIG. The incident surface concave portion 64a is closed by the substrate 71 on which the first light source 72a is mounted. The second lens body 62b has an incident surface concave portion 64a formed in a second incident surface 64e. The incident surface concave portion 64a on the second lens body 62b side is closed by the substrate 71 on which the second light source 72b is mounted, and is separated from the incident surface concave portion 64a on the first lens body 62a side. Therefore, loss of light emitted from the first light source 72a or the second light source 72b can be suppressed. Moreover, interference between the light emitted by the first light source 72a and the light emitted by the second light source 72b can be suppressed. Therefore, light can be efficiently emitted from the first emission surface 65d and the second emission surface 65e.

According to another feature of the present disclosure, as shown in FIGS. 14 and 15, the first lens body 62a projects inwardly from the outer peripheral edge of the first output surface 65d and is cylindrical on the inner peripheral side and spherical on the outer peripheral side. has an output surface convex portion 65b having a partial shape of . Therefore, the output surface convex portion 65b can refract the light emitted from the output surface convex portion 65b toward the extension direction of the first central axis 73. As shown in FIG. Therefore, a clear shadow can be projected on the surface of the material W to be cut by the light emitted from the first emission surface 65d in the same direction.

According to another feature of the present disclosure, the first lens body 62a has a cylindrical convex exit surface 65b as shown in FIGS. A central concave portion 65c is provided at the axial center of the output surface convex portion 65b. Therefore, the first lens body 62a can be provided thin without changing the direction of the light emitted from the first emission surface 65d. Therefore, the irradiation unit 60 can be made compact.

According to another feature of the present disclosure, the first exit surface 65d of the first lens body 62a has an arc-shaped concave portion 65a surrounding the outer periphery of the exit surface convex portion 65b, as shown in FIGS. have. Therefore, the first lens body 62a can be thinly provided in a relatively wide area between the light emitting surface convex portion 65b and the first outer peripheral edge 65f without changing the direction of the light emitted from the first light emitting surface 65d. Therefore, the irradiation unit 60 can be made compact and lightweight.

According to another feature of the present disclosure, the first lens body 62a has legs 67 extending laterally from the first outer peripheral edge 65f of the first exit surface 65d as shown in FIGS. Therefore, it is possible to prevent the light passing through the first lens body 62 a from leaking from the leg portion 67 . Therefore, loss of light emitted from the first light source 72a can be suppressed.

According to another feature of the present disclosure, as shown in FIG. 4, the cutting machine main body 10 is vertically swingable about a vertically swinging support shaft 10a with respect to the base 2 on which the material W to be cut is placed. is. The irradiation unit 60 has an output shaft that is the rotation center of the cutting tool 11 in a horizontal virtual plane S that passes through the lower end of the cutting tool 11 and corresponds to the upper surface of the material W to be cut when the cutting machine body 10 is positioned at the top dead center. A front place farther from the vertical swing support shaft 10a than directly below 23 is irradiated. Therefore, the shadow of the cutting tool 11 can be projected at a position that is easy for the user positioned in front of the cutting machine 1 to see.

Next, a second embodiment of the present disclosure will be described with reference to FIGS. 18-22. A cutting machine 80 of the second embodiment has a lens coupling body 82 of an irradiation section 81 shown in FIG. 18 instead of the lens coupling body 61 of the irradiation section 60 shown in FIG. The lens connecting body 82 is formed as a single member by connecting two lens bodies 83, a first lens body 83a and a second lens body 83b. The lens coupler 82 has three legs 88 . The leg portion 88 has a columnar portion 88b that can be inserted into the through hole 71c (see FIG. 8) of the substrate 71. As shown in FIG.

As shown in FIG. 22, the first lens body 83a is arranged around a first central axis 89 passing through the first light source center 72c and perpendicular to the surface of the first light source 72a. The second lens body 83b is arranged around a second central axis 90 passing through the second light source center 72d and perpendicular to the surface of the second light source 72b. The first center shaft 89 and the second center shaft 90 extend in the same direction. The first light source 72a and the second light source 72b are arranged in the same positional relationship as in the cutting machine 1 with respect to the substrate 71 and the cutting tool 11 (see FIG. 10). The second lens body 83b is formed symmetrically with the first lens body 83a. In the following description, only one of the overlapping structures of the first lens body 83a and the second lens body 83b will be described in detail.

As shown in FIGS. 18 and 22, the first lens body 83a has a substantially conical shape whose diameter increases from the entrance surface 85 side toward the exit surface 86 side. The first entrance surface 85c and the first exit surface 86a of the first lens body 83a have circular arc-shaped outer peripheral edges centered on the first central axis 89 . The second entrance surface 85d and the second exit surface 86b of the second lens body 83b have circular arc-shaped outer peripheral edges centered on the second central axis 90 .

As shown in FIGS. 19 and 22, the first lens body 83a has a planar substrate contact surface 84 on the end surface on the incident surface 85 side. The substrate contact surface 84 contacts the surface of the substrate 71 . The incident surface 85 includes a first incident surface 85c on the first lens body 83a side and a second incident surface 85d on the second lens body 83b side. The first incident surface 85 c has an incident surface recessed portion 85 a recessed from the substrate contact surface 84 in the axial direction of the first central axis 89 . The incident surface recess 85 a is recessed in a substantially cylindrical shape centered on the first central axis 89 . The first light source 72a is accommodated in the incident surface concave portion 85a with the first light source center 72c arranged on the first central axis 89 .

As shown in FIG. 22, the second light source 72b is accommodated in the incident surface concave portion 85a on the second lens body 83b side with the second light source center 72d arranged on the second central axis 90. As shown in FIG. The two incident surface recesses 85a are closed while accommodating the first light source 72a or the second light source 72b by bringing the substrate 71 and the substrate contact surface 84 into contact. The incident surface concave portion (first incident surface concave portion) 85a on the first lens body 83a side and the incident surface concave portion (second incident surface concave portion) 85a on the second lens body 83b side are separated by a substrate contact surface 84 therebetween. It is

As shown in FIG. 22, the side surface 85b of the incident surface recessed portion 85a includes at least a portion of an arcuate cross section centered on the first light source center 72c on the cross section passing through the first central axis 89. As shown in FIG. The arcuate cross-sectional shape of the side surface 85b is provided mainly below the surface of the first light source 72a. The bottom surface of the incident surface concave portion 85a is formed into a spherical convex portion centered on the first central axis 89 and protruding toward the first light source 72a. Both the incident surface recessed portion 85 a and the side surface 85 b are incident surfaces 85 through which the light emitted by the LED 72 enters the lens body 83 .

As shown in FIG. 21, the exit surface 86 includes a first exit surface 86a on the side of the first lens body 83a and a second exit surface 86b on the side of the second lens body 83b. The first emission surface 86 a has an arc-shaped first outer peripheral edge 86 d centered on the first central axis 89 . A first outermost peripheral edge portion 86f on the first outer peripheral edge 86d is located farthest from the first central axis 89 and has a first distance r1 therebetween. The second emission surface 86b has an arc-shaped second outer peripheral edge 86e centered on the second central axis 90 . A second outermost peripheral edge portion 86g on the second outer peripheral edge 86e is positioned farthest from the second central axis 90 and has a second distance r2 therebetween. Any point on the arc-shaped first outer peripheral edge 86d and the second outer peripheral edge 86e corresponds to the first outermost peripheral edge 86f and the second outermost peripheral edge 86g.

As shown in FIG. 21, the distance r3 between the first central axis 89 and the second central axis 90 is smaller than the sum of the first distance r1 and the second distance r2. Therefore, the first emission surface 86a and the second emission surface 86b have a shape in which the central portions of the two arc shapes are partially overlapped when viewed from the first central axis 89 direction. The first outer peripheral edge 86d and the second outer peripheral edge 86e intersect each other at their ends. The first outer peripheral edge 86d has an arc shape centered on the first central axis 89 and having a central angle A1. The second outer peripheral edge 86e has an arc shape centered on the second central axis 90 with a central angle A1. The central angle A1 is greater than 180° and less than 360°.

As shown in FIGS. 18 and 22, the first lens body 83a has an output surface convex portion 86c projecting in the axial direction of the first central shaft 89 radially inward of the first outer peripheral edge 86d. The exit surface convex portion 86c has a spherical shape with a predetermined point on the first central axis 89 as the center. The emission surface convex portion 86c is the emission surface 86 from which the light emitted by the LED 72 is emitted.

As shown in FIGS. 18 and 22, the first lens body 83a has a substantially conical outer peripheral side surface 87 connecting the outer peripheral end of the substrate contact surface 84 and the first outer peripheral edge 86d. The outer peripheral side surface 87 is an outer reflecting surface 87a that reflects light toward the inside of the first lens body 83a within the first lens body 83a. The outer reflecting surface 87a has a diameter centered on the first central axis that increases from the first entrance surface 85c toward the first exit surface 86a. In addition, the outer reflecting surface 87a is formed in an outwardly convex arc shape on a cross section passing through the first central axis 89 . The outer reflecting surface 87a is a cross-sectional arc line 87b having an arc-shaped outer peripheral edge on a cross section orthogonal to the first central axis 89 . The shape of the cross-sectional arc line 87b is the same as that of the cross-sectional arc line 66b shown in FIG.

As shown in FIG. 22, the light emitted from the second light source center 72d of the second light source 72b enters the lens body 83 from the bottom surface or the side surface 85b of the incident surface concave portion 85a. The light incident from the bottom surface of the entrance surface recess 85a is refracted in two stages, the bottom surface of the entrance surface recess 85a and the outer peripheral surface of the exit surface protrusion 86c. As a result, the light is emitted in the axial direction of the second central shaft 90 from the outer peripheral surface of the emission surface convex portion 86c. The light incident from the side surface 85b travels in the normal direction of the side surface 85b and is reflected in the axial direction of the second central axis 90 by the outer reflecting surface 87a. Then, the light is emitted in the axial direction of the second central axis 90 from the region between the emission surface convex portion 86c and the second outer peripheral edge 86e. Thus, the light emitted from the second emission surface 86b is emitted in a state aligned in the axial direction of the second central axis 90. As shown in FIG. Similarly, the light emitted from the first light source 72a and emitted from the first emission surface 86a is also emitted in a state aligned in the axial direction of the first central axis 89. As shown in FIG.

As shown in FIGS. 19 and 20 , the leg portion 88 has a plate-like outwardly extending portion 88 a extending from the substrate contact surface 84 toward the side of the lens body 83 . The columnar portion 88b extends upward from the outwardly extending portion 88a. Therefore, the leg portion 88 is arranged at a position out of the path of light passing through the lens body 83 .

Various modifications can be made to the cutting machines 1 and 80 of the embodiments described above. The lens coupling bodies 61 and 82 having circular first exit surfaces 65d and 86a and second exit surfaces 65e and 86b when viewed from the axial direction of the first central shafts 73 and 89 are illustrated. Alternatively, when viewed from the axial direction of the first central shafts 73 and 89, the first and second exit surfaces may be elliptical, oval in which two semicircles and a rectangle are combined, or the like. . A configuration in which the first lens bodies 62a, 83a and the second lens bodies 62b, 83b are provided as a single member is illustrated. Alternatively, the first lens body and the second lens body may be provided as separate members. The shapes of the first lens body and the second lens body may be different from each other.

First central axes 73, 89 and second central axes 74, 90 parallel to each other are illustrated. Alternatively, for example, the first central axis and the second central axis may cross each other toward the cutting tool 11 side. The first light source center 72c and the second light source center 72d are not limited to the geometric centers of the first light source 72a and the second light source 72b, but include the brightest light emitting centers. First center shafts 73, 89 and second center shafts 74, 90 extending perpendicularly to the surfaces of the first light source 72a and the second light source 72b are illustrated. The arrangement relationship between the first light source 72a, the second light source 72b, the first central axes 73, 89, and the second central axes 74, 90 is not limited to this. For example, a case in which the main irradiation direction of the first light source is parallel to the first central axis is also included in the configuration "the first central axis is perpendicular to the first light source." Alternatively, for example, the positional relationship between the first light source and the first central axis when light is emitted from any location on the first emission surface parallel to the first central axis is "the first central axis is relative to the first light source. are included in the “perpendicular” configuration.

The lens body 62 in which the area of the exit surface 65 is larger than the area of the entrance surface 64 is illustrated. Alternatively, a lens body may be used in which the area of the exit surface is smaller than the area of the entrance surface. The cross-sectional shapes of the outer reflecting surfaces 66a, 87a, the spherical convex portion 64c, the emitting surface convex portions 65b, 86c, etc. are not limited to the arc shape of a perfect circle, and may be other curvilinear shapes such as an elliptical shape, a parabolic shape, and a spindle shape. can be For example, a lamp or the like may be used instead of the LED. The present disclosure can be applied not only to a slide circular saw, but also to a desktop circular saw, a portable circular saw, etc., which do not have a sliding function of the cutting machine body.

1... Cutting machine (first embodiment)
2 Base 2a Rotary spindle 3 Auxiliary table 4 Turntable 4a Top surface of table 4b Arm support 5 Table extension 5a Cutting edge plate 5b Slot 6 Positioning fence 6a Positioning surface 7 Miter scale plate 7a Fixing screw 7b Positioning recess 10 Cutting machine main body 10a Vertical swing shaft 11 Cutting tool 11a Right side 11b Left side 12 Fixed cover 12a Arrow 12b Screw hole 13 Movable cover 13a Through hole 14 Fixing screw 15 Outer flange 16 Inner flange 17 Dust collection guide 17a Dust collection hose 18 Rear dust collection port 18a Dust collection Hose 20 Motor housing 20a Intake port 20b Exhaust port 21 Electric motor 22 Gear housing 23 Output shaft 25 Battery mounting portion 26 Battery pack 27 Controller housing 28 Controller 30 Handle portion 31 Operation Handle 32 Switch lever 33 Lock-off button 34 Irradiation section switch 40 Main body support arm 40a Horizontal tilt support shaft 41 Slide bar 42 Slide base 45 Turntable fixing mechanism 46 Grip part 47 Fixing rod 50 Positive lock mechanism 51 Unlock lever 52 Positioning pin 60 Irradiation unit 61 Lens coupling body 62 Lens body 62a First lens body 62b Second lens body 63 Substrate contact surface 64 Incidence Surfaces 64a... Incident surface recess (first incident surface recess, second incident surface recess) 64b...Side surface 64c...Spherical convex portion 64d...First incident surface 64e...Second incident surface 65...Emission surface 65a... Circular concave portion 65b...Exiting surface convex portion 65c...Center concave portion 65d...First outgoing surface 65e...Second outgoing surface 65f...First outer peripheral edge 65g...Second outer peripheral edge 65h...First outermost peripheral edge , 65i Second outermost peripheral edge portion 66 Peripheral side surface 66a Outer reflecting surface 66b Cross-sectional arc line 67 Leg portion 67a Outwardly extending portion 67b Columnar portion 67c Expanded diameter portion 70 Irradiation unit cover 70a Fastening bolt 70b Through hole 70c Screw hole 71 Substrate 71a LED control unit 71b, 71c Through hole 71d Fastening bolt 72 LED (light source) 72a First Light source 72b Second light source 72c First light source center 72d Second light source center 73 First central shaft 74 Second central shaft 80 Cutting machine (second embodiment)
81... Irradiation part 82... Lens connection body 83... Lens body 83a... First lens body 83b... Second lens body 84... Substrate contact surface 85... Incidence surface 85a... Incidence surface concave portion (spherical convex portion, first incident surface concave portion, second incident surface concave portion)
85b... Side surface 85c... First incident surface 85d... Second incident surface 86... Output surface 86a... First output surface 86b... Second output surface 86c... Output surface convex portion 86d... First outer peripheral edge 86e Second outer peripheral edge 86f First outermost peripheral edge 86g Second outermost peripheral edge 87 Outer peripheral side surface 87a Outer reflecting surface 87b Cross-sectional arc line 88 Leg 88a Outer extending portion , 88b... Columnar portion 89... First central axis 90... Second central axis W... Material to be cut S... Virtual plane L... Radiation A1, A2... Central angle r1... First distance, r2... Second distance, r3... Distance K (between the first central axis and the second central axis)...Predetermined angle

Claims (13)

a cutting machine,
a cutting machine body equipped with a disk-shaped cutting tool;
An irradiation unit that irradiates light toward the cutting tool from the radially outer side of the cutting tool,
The irradiation unit is
a first light source and a second light source arranged with a virtual plane including the cutting tool therebetween;
a first lens body comprising a first incident surface into which light is incident from the first light source and a first exit surface from which light is emitted;
a second lens body having a second incident surface on which light from the second light source is incident and a second exit surface from which the light is emitted;
The first exit surface has a first outermost peripheral edge that is farthest from a first central axis that passes through the first light source center of the first light source and is perpendicular to the first light source, and that has a first distance. ,
The second exit surface has a second outermost peripheral edge that is farthest from a second central axis that passes through the second light source center of the second light source and is perpendicular to the second light source, and that has a second distance. ,
The cutting machine, wherein the first light source and the second light source are arranged such that the distance between the first central axis and the second central axis is smaller than the sum of the first distance and the second distance. A cutting machine according to claim 1,
The cutting machine, wherein the first lens body and the second lens body are one member. A cutting machine according to claim 1 or 2,
The first emission surface has an arc-shaped first outer peripheral edge centered on the first central axis and having a length over a range larger than 180°,
The second emission surface has an arc-shaped second outer peripheral edge centered on the second central axis and having a length over a range larger than 180°, and the first outer peripheral edge and the second outer peripheral edge intersect. cutting machine. A cutting machine according to any one of claims 1 to 3,
The first lens body has an outer reflecting surface that reflects light incident from the first entrance surface and passing through the first lens body toward the first exit surface,
The outer reflecting surface has an outwardly convex curvilinear shape on a cross section passing through the first central axis and becomes farther from the first central axis in the direction from the first incidence surface toward the first exit surface. A cutting machine. A cutting machine according to claim 4,
The outer reflecting surface has an arcuate cross-section having a length over a range larger than 180° centering on the first central axis at any position from the first incident surface to the first exit surface. . A cutting machine according to any one of claims 1 to 5,
The cutting machine, wherein the first lens body has an incident surface concave portion formed on the first incident surface, and a spherical convex portion projecting from a bottom surface of the incident surface concave portion toward the first light source. A cutting machine according to claim 6,
At least part of the side surface of the incident surface concave portion is an arc-shaped cutting machine centered on the center of the first light source on a cross section passing through the first central axis. A cutting machine according to any one of claims 1 to 7,
the first lens body having a first incident surface recess formed on the first incident surface, the first incident surface recess being closed by a substrate on which the first light source is mounted;
The second lens body has a second incident surface concave portion formed on the second incident surface, the second incident surface concave portion being closed by a substrate on which the second light source is mounted and the first incident surface concave portion. A cutting machine that is partitioned with an entrance surface recess. A cutting machine according to any one of claims 1 to 8,
The cutting machine, wherein the first lens body has an output surface convex portion that protrudes inward from the outer peripheral edge of the first output surface and has a cylindrical shape or a partial spherical shape. A cutting machine according to claim 9,
The cutting machine, wherein the first lens body has the cylindrical projection on the exit surface, and has a central recess at the center of the axis of the projection on the exit surface. A cutting machine according to claim 9,
The cutting machine, wherein the first output surface of the first lens body has an arc-shaped concave portion surrounding the outer periphery of the output surface convex portion. A cutting machine according to any one of claims 1 to 11,
The cutting machine, wherein the first lens body has legs extending laterally from an outer peripheral edge of the first entrance surface or the first exit surface. A cutting machine according to any one of claims 1 to 12,
The cutting machine main body is vertically swingable about a vertical swing shaft with respect to a base on which a material to be cut is placed,
When the cutting machine main body is positioned at the top dead center, the irradiating section is positioned above the center of rotation of the cutting tool on a horizontal imaginary plane passing through the lower end of the cutting tool and corresponding to the upper surface of the material to be cut. A cutting machine that irradiates a place far from the vertical swing shaft.

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